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54a90588 PM |
1 | #define pr_fmt(fmt) "irq: " fmt |
2 | ||
cc79ca69 GL |
3 | #include <linux/debugfs.h> |
4 | #include <linux/hardirq.h> | |
5 | #include <linux/interrupt.h> | |
08a543ad | 6 | #include <linux/irq.h> |
cc79ca69 | 7 | #include <linux/irqdesc.h> |
08a543ad GL |
8 | #include <linux/irqdomain.h> |
9 | #include <linux/module.h> | |
10 | #include <linux/mutex.h> | |
11 | #include <linux/of.h> | |
7e713301 | 12 | #include <linux/of_address.h> |
64be38ab | 13 | #include <linux/of_irq.h> |
5ca4db61 | 14 | #include <linux/topology.h> |
cc79ca69 | 15 | #include <linux/seq_file.h> |
7e713301 | 16 | #include <linux/slab.h> |
cc79ca69 GL |
17 | #include <linux/smp.h> |
18 | #include <linux/fs.h> | |
08a543ad GL |
19 | |
20 | static LIST_HEAD(irq_domain_list); | |
21 | static DEFINE_MUTEX(irq_domain_mutex); | |
22 | ||
cc79ca69 | 23 | static DEFINE_MUTEX(revmap_trees_mutex); |
68700650 | 24 | static struct irq_domain *irq_default_domain; |
cc79ca69 | 25 | |
f8264e34 JL |
26 | static int irq_domain_alloc_descs(int virq, unsigned int nr_irqs, |
27 | irq_hw_number_t hwirq, int node); | |
28 | static void irq_domain_check_hierarchy(struct irq_domain *domain); | |
29 | ||
cc79ca69 | 30 | /** |
fa40f377 | 31 | * __irq_domain_add() - Allocate a new irq_domain data structure |
cc79ca69 | 32 | * @of_node: optional device-tree node of the interrupt controller |
fa40f377 | 33 | * @size: Size of linear map; 0 for radix mapping only |
a257954b | 34 | * @hwirq_max: Maximum number of interrupts supported by controller |
fa40f377 GL |
35 | * @direct_max: Maximum value of direct maps; Use ~0 for no limit; 0 for no |
36 | * direct mapping | |
f8264e34 | 37 | * @ops: domain callbacks |
a8db8cf0 | 38 | * @host_data: Controller private data pointer |
cc79ca69 | 39 | * |
a257954b JL |
40 | * Allocates and initialize and irq_domain structure. |
41 | * Returns pointer to IRQ domain, or NULL on failure. | |
cc79ca69 | 42 | */ |
ddaf144c GL |
43 | struct irq_domain *__irq_domain_add(struct device_node *of_node, int size, |
44 | irq_hw_number_t hwirq_max, int direct_max, | |
fa40f377 GL |
45 | const struct irq_domain_ops *ops, |
46 | void *host_data) | |
cc79ca69 | 47 | { |
a8db8cf0 | 48 | struct irq_domain *domain; |
cc79ca69 | 49 | |
cef5075c GL |
50 | domain = kzalloc_node(sizeof(*domain) + (sizeof(unsigned int) * size), |
51 | GFP_KERNEL, of_node_to_nid(of_node)); | |
a8db8cf0 | 52 | if (WARN_ON(!domain)) |
cc79ca69 GL |
53 | return NULL; |
54 | ||
55 | /* Fill structure */ | |
1aa0dd94 | 56 | INIT_RADIX_TREE(&domain->revmap_tree, GFP_KERNEL); |
68700650 | 57 | domain->ops = ops; |
a8db8cf0 | 58 | domain->host_data = host_data; |
68700650 | 59 | domain->of_node = of_node_get(of_node); |
ddaf144c | 60 | domain->hwirq_max = hwirq_max; |
1aa0dd94 | 61 | domain->revmap_size = size; |
fa40f377 | 62 | domain->revmap_direct_max_irq = direct_max; |
f8264e34 | 63 | irq_domain_check_hierarchy(domain); |
cc79ca69 | 64 | |
a8db8cf0 GL |
65 | mutex_lock(&irq_domain_mutex); |
66 | list_add(&domain->link, &irq_domain_list); | |
67 | mutex_unlock(&irq_domain_mutex); | |
fa40f377 | 68 | |
1aa0dd94 | 69 | pr_debug("Added domain %s\n", domain->name); |
fa40f377 | 70 | return domain; |
a8db8cf0 | 71 | } |
fa40f377 | 72 | EXPORT_SYMBOL_GPL(__irq_domain_add); |
a8db8cf0 | 73 | |
58ee99ad PM |
74 | /** |
75 | * irq_domain_remove() - Remove an irq domain. | |
76 | * @domain: domain to remove | |
77 | * | |
78 | * This routine is used to remove an irq domain. The caller must ensure | |
79 | * that all mappings within the domain have been disposed of prior to | |
80 | * use, depending on the revmap type. | |
81 | */ | |
82 | void irq_domain_remove(struct irq_domain *domain) | |
83 | { | |
84 | mutex_lock(&irq_domain_mutex); | |
85 | ||
cef5075c GL |
86 | /* |
87 | * radix_tree_delete() takes care of destroying the root | |
88 | * node when all entries are removed. Shout if there are | |
89 | * any mappings left. | |
90 | */ | |
1aa0dd94 | 91 | WARN_ON(domain->revmap_tree.height); |
58ee99ad PM |
92 | |
93 | list_del(&domain->link); | |
94 | ||
95 | /* | |
96 | * If the going away domain is the default one, reset it. | |
97 | */ | |
98 | if (unlikely(irq_default_domain == domain)) | |
99 | irq_set_default_host(NULL); | |
100 | ||
101 | mutex_unlock(&irq_domain_mutex); | |
102 | ||
1aa0dd94 | 103 | pr_debug("Removed domain %s\n", domain->name); |
58ee99ad | 104 | |
fa40f377 GL |
105 | of_node_put(domain->of_node); |
106 | kfree(domain); | |
58ee99ad | 107 | } |
ecd84eb2 | 108 | EXPORT_SYMBOL_GPL(irq_domain_remove); |
58ee99ad | 109 | |
781d0f46 | 110 | /** |
fa40f377 | 111 | * irq_domain_add_simple() - Register an irq_domain and optionally map a range of irqs |
781d0f46 MB |
112 | * @of_node: pointer to interrupt controller's device tree node. |
113 | * @size: total number of irqs in mapping | |
94a63da0 | 114 | * @first_irq: first number of irq block assigned to the domain, |
fa40f377 GL |
115 | * pass zero to assign irqs on-the-fly. If first_irq is non-zero, then |
116 | * pre-map all of the irqs in the domain to virqs starting at first_irq. | |
f8264e34 | 117 | * @ops: domain callbacks |
781d0f46 MB |
118 | * @host_data: Controller private data pointer |
119 | * | |
fa40f377 GL |
120 | * Allocates an irq_domain, and optionally if first_irq is positive then also |
121 | * allocate irq_descs and map all of the hwirqs to virqs starting at first_irq. | |
781d0f46 MB |
122 | * |
123 | * This is intended to implement the expected behaviour for most | |
fa40f377 GL |
124 | * interrupt controllers. If device tree is used, then first_irq will be 0 and |
125 | * irqs get mapped dynamically on the fly. However, if the controller requires | |
126 | * static virq assignments (non-DT boot) then it will set that up correctly. | |
781d0f46 MB |
127 | */ |
128 | struct irq_domain *irq_domain_add_simple(struct device_node *of_node, | |
129 | unsigned int size, | |
130 | unsigned int first_irq, | |
131 | const struct irq_domain_ops *ops, | |
132 | void *host_data) | |
133 | { | |
fa40f377 GL |
134 | struct irq_domain *domain; |
135 | ||
ddaf144c | 136 | domain = __irq_domain_add(of_node, size, size, 0, ops, host_data); |
fa40f377 GL |
137 | if (!domain) |
138 | return NULL; | |
2854d167 | 139 | |
fa40f377 | 140 | if (first_irq > 0) { |
2854d167 | 141 | if (IS_ENABLED(CONFIG_SPARSE_IRQ)) { |
fa40f377 GL |
142 | /* attempt to allocated irq_descs */ |
143 | int rc = irq_alloc_descs(first_irq, first_irq, size, | |
144 | of_node_to_nid(of_node)); | |
145 | if (rc < 0) | |
d202b7b9 LW |
146 | pr_info("Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n", |
147 | first_irq); | |
fa40f377 | 148 | } |
ddaf144c | 149 | irq_domain_associate_many(domain, first_irq, 0, size); |
2854d167 LW |
150 | } |
151 | ||
fa40f377 | 152 | return domain; |
781d0f46 | 153 | } |
346dbb79 | 154 | EXPORT_SYMBOL_GPL(irq_domain_add_simple); |
781d0f46 | 155 | |
a8db8cf0 GL |
156 | /** |
157 | * irq_domain_add_legacy() - Allocate and register a legacy revmap irq_domain. | |
158 | * @of_node: pointer to interrupt controller's device tree node. | |
1bc04f2c GL |
159 | * @size: total number of irqs in legacy mapping |
160 | * @first_irq: first number of irq block assigned to the domain | |
161 | * @first_hwirq: first hwirq number to use for the translation. Should normally | |
162 | * be '0', but a positive integer can be used if the effective | |
163 | * hwirqs numbering does not begin at zero. | |
a8db8cf0 GL |
164 | * @ops: map/unmap domain callbacks |
165 | * @host_data: Controller private data pointer | |
166 | * | |
167 | * Note: the map() callback will be called before this function returns | |
168 | * for all legacy interrupts except 0 (which is always the invalid irq for | |
169 | * a legacy controller). | |
170 | */ | |
171 | struct irq_domain *irq_domain_add_legacy(struct device_node *of_node, | |
1bc04f2c GL |
172 | unsigned int size, |
173 | unsigned int first_irq, | |
174 | irq_hw_number_t first_hwirq, | |
a18dc81b | 175 | const struct irq_domain_ops *ops, |
a8db8cf0 GL |
176 | void *host_data) |
177 | { | |
1bc04f2c | 178 | struct irq_domain *domain; |
a8db8cf0 | 179 | |
ddaf144c GL |
180 | domain = __irq_domain_add(of_node, first_hwirq + size, |
181 | first_hwirq + size, 0, ops, host_data); | |
f8264e34 JL |
182 | if (domain) |
183 | irq_domain_associate_many(domain, first_irq, first_hwirq, size); | |
1bc04f2c | 184 | |
a8db8cf0 GL |
185 | return domain; |
186 | } | |
ecd84eb2 | 187 | EXPORT_SYMBOL_GPL(irq_domain_add_legacy); |
a8db8cf0 | 188 | |
cc79ca69 GL |
189 | /** |
190 | * irq_find_host() - Locates a domain for a given device node | |
191 | * @node: device-tree node of the interrupt controller | |
192 | */ | |
193 | struct irq_domain *irq_find_host(struct device_node *node) | |
194 | { | |
195 | struct irq_domain *h, *found = NULL; | |
a18dc81b | 196 | int rc; |
cc79ca69 GL |
197 | |
198 | /* We might want to match the legacy controller last since | |
199 | * it might potentially be set to match all interrupts in | |
200 | * the absence of a device node. This isn't a problem so far | |
201 | * yet though... | |
202 | */ | |
203 | mutex_lock(&irq_domain_mutex); | |
a18dc81b GL |
204 | list_for_each_entry(h, &irq_domain_list, link) { |
205 | if (h->ops->match) | |
206 | rc = h->ops->match(h, node); | |
207 | else | |
208 | rc = (h->of_node != NULL) && (h->of_node == node); | |
209 | ||
210 | if (rc) { | |
cc79ca69 GL |
211 | found = h; |
212 | break; | |
213 | } | |
a18dc81b | 214 | } |
cc79ca69 GL |
215 | mutex_unlock(&irq_domain_mutex); |
216 | return found; | |
217 | } | |
218 | EXPORT_SYMBOL_GPL(irq_find_host); | |
219 | ||
220 | /** | |
221 | * irq_set_default_host() - Set a "default" irq domain | |
68700650 | 222 | * @domain: default domain pointer |
cc79ca69 GL |
223 | * |
224 | * For convenience, it's possible to set a "default" domain that will be used | |
225 | * whenever NULL is passed to irq_create_mapping(). It makes life easier for | |
226 | * platforms that want to manipulate a few hard coded interrupt numbers that | |
227 | * aren't properly represented in the device-tree. | |
228 | */ | |
68700650 | 229 | void irq_set_default_host(struct irq_domain *domain) |
cc79ca69 | 230 | { |
54a90588 | 231 | pr_debug("Default domain set to @0x%p\n", domain); |
cc79ca69 | 232 | |
68700650 | 233 | irq_default_domain = domain; |
cc79ca69 | 234 | } |
ecd84eb2 | 235 | EXPORT_SYMBOL_GPL(irq_set_default_host); |
cc79ca69 | 236 | |
43a77591 | 237 | void irq_domain_disassociate(struct irq_domain *domain, unsigned int irq) |
913af207 | 238 | { |
ddaf144c GL |
239 | struct irq_data *irq_data = irq_get_irq_data(irq); |
240 | irq_hw_number_t hwirq; | |
913af207 | 241 | |
ddaf144c GL |
242 | if (WARN(!irq_data || irq_data->domain != domain, |
243 | "virq%i doesn't exist; cannot disassociate\n", irq)) | |
244 | return; | |
913af207 | 245 | |
ddaf144c GL |
246 | hwirq = irq_data->hwirq; |
247 | irq_set_status_flags(irq, IRQ_NOREQUEST); | |
913af207 | 248 | |
ddaf144c GL |
249 | /* remove chip and handler */ |
250 | irq_set_chip_and_handler(irq, NULL, NULL); | |
913af207 | 251 | |
ddaf144c GL |
252 | /* Make sure it's completed */ |
253 | synchronize_irq(irq); | |
913af207 | 254 | |
ddaf144c GL |
255 | /* Tell the PIC about it */ |
256 | if (domain->ops->unmap) | |
257 | domain->ops->unmap(domain, irq); | |
258 | smp_mb(); | |
913af207 | 259 | |
ddaf144c GL |
260 | irq_data->domain = NULL; |
261 | irq_data->hwirq = 0; | |
913af207 | 262 | |
ddaf144c GL |
263 | /* Clear reverse map for this hwirq */ |
264 | if (hwirq < domain->revmap_size) { | |
265 | domain->linear_revmap[hwirq] = 0; | |
266 | } else { | |
267 | mutex_lock(&revmap_trees_mutex); | |
268 | radix_tree_delete(&domain->revmap_tree, hwirq); | |
269 | mutex_unlock(&revmap_trees_mutex); | |
913af207 GL |
270 | } |
271 | } | |
272 | ||
ddaf144c GL |
273 | int irq_domain_associate(struct irq_domain *domain, unsigned int virq, |
274 | irq_hw_number_t hwirq) | |
cc79ca69 | 275 | { |
ddaf144c GL |
276 | struct irq_data *irq_data = irq_get_irq_data(virq); |
277 | int ret; | |
cc79ca69 | 278 | |
ddaf144c GL |
279 | if (WARN(hwirq >= domain->hwirq_max, |
280 | "error: hwirq 0x%x is too large for %s\n", (int)hwirq, domain->name)) | |
281 | return -EINVAL; | |
282 | if (WARN(!irq_data, "error: virq%i is not allocated", virq)) | |
283 | return -EINVAL; | |
284 | if (WARN(irq_data->domain, "error: virq%i is already associated", virq)) | |
285 | return -EINVAL; | |
cc79ca69 | 286 | |
ddaf144c GL |
287 | mutex_lock(&irq_domain_mutex); |
288 | irq_data->hwirq = hwirq; | |
289 | irq_data->domain = domain; | |
290 | if (domain->ops->map) { | |
291 | ret = domain->ops->map(domain, virq, hwirq); | |
292 | if (ret != 0) { | |
293 | /* | |
294 | * If map() returns -EPERM, this interrupt is protected | |
295 | * by the firmware or some other service and shall not | |
296 | * be mapped. Don't bother telling the user about it. | |
297 | */ | |
298 | if (ret != -EPERM) { | |
299 | pr_info("%s didn't like hwirq-0x%lx to VIRQ%i mapping (rc=%d)\n", | |
300 | domain->name, hwirq, virq, ret); | |
f5a1ad05 | 301 | } |
ddaf144c GL |
302 | irq_data->domain = NULL; |
303 | irq_data->hwirq = 0; | |
304 | mutex_unlock(&irq_domain_mutex); | |
305 | return ret; | |
98aa468e GL |
306 | } |
307 | ||
ddaf144c GL |
308 | /* If not already assigned, give the domain the chip's name */ |
309 | if (!domain->name && irq_data->chip) | |
310 | domain->name = irq_data->chip->name; | |
311 | } | |
2a71a1a9 | 312 | |
ddaf144c GL |
313 | if (hwirq < domain->revmap_size) { |
314 | domain->linear_revmap[hwirq] = virq; | |
315 | } else { | |
316 | mutex_lock(&revmap_trees_mutex); | |
317 | radix_tree_insert(&domain->revmap_tree, hwirq, irq_data); | |
318 | mutex_unlock(&revmap_trees_mutex); | |
98aa468e | 319 | } |
ddaf144c GL |
320 | mutex_unlock(&irq_domain_mutex); |
321 | ||
322 | irq_clear_status_flags(virq, IRQ_NOREQUEST); | |
cc79ca69 GL |
323 | |
324 | return 0; | |
325 | } | |
ddaf144c | 326 | EXPORT_SYMBOL_GPL(irq_domain_associate); |
98aa468e | 327 | |
ddaf144c GL |
328 | void irq_domain_associate_many(struct irq_domain *domain, unsigned int irq_base, |
329 | irq_hw_number_t hwirq_base, int count) | |
330 | { | |
331 | int i; | |
332 | ||
333 | pr_debug("%s(%s, irqbase=%i, hwbase=%i, count=%i)\n", __func__, | |
334 | of_node_full_name(domain->of_node), irq_base, (int)hwirq_base, count); | |
335 | ||
336 | for (i = 0; i < count; i++) { | |
337 | irq_domain_associate(domain, irq_base + i, hwirq_base + i); | |
338 | } | |
cc79ca69 | 339 | } |
98aa468e | 340 | EXPORT_SYMBOL_GPL(irq_domain_associate_many); |
cc79ca69 GL |
341 | |
342 | /** | |
343 | * irq_create_direct_mapping() - Allocate an irq for direct mapping | |
68700650 | 344 | * @domain: domain to allocate the irq for or NULL for default domain |
cc79ca69 GL |
345 | * |
346 | * This routine is used for irq controllers which can choose the hardware | |
347 | * interrupt numbers they generate. In such a case it's simplest to use | |
1aa0dd94 GL |
348 | * the linux irq as the hardware interrupt number. It still uses the linear |
349 | * or radix tree to store the mapping, but the irq controller can optimize | |
350 | * the revmap path by using the hwirq directly. | |
cc79ca69 | 351 | */ |
68700650 | 352 | unsigned int irq_create_direct_mapping(struct irq_domain *domain) |
cc79ca69 GL |
353 | { |
354 | unsigned int virq; | |
355 | ||
68700650 GL |
356 | if (domain == NULL) |
357 | domain = irq_default_domain; | |
cc79ca69 | 358 | |
5ca4db61 | 359 | virq = irq_alloc_desc_from(1, of_node_to_nid(domain->of_node)); |
03848373 | 360 | if (!virq) { |
54a90588 | 361 | pr_debug("create_direct virq allocation failed\n"); |
03848373 | 362 | return 0; |
cc79ca69 | 363 | } |
1aa0dd94 | 364 | if (virq >= domain->revmap_direct_max_irq) { |
cc79ca69 | 365 | pr_err("ERROR: no free irqs available below %i maximum\n", |
1aa0dd94 | 366 | domain->revmap_direct_max_irq); |
cc79ca69 GL |
367 | irq_free_desc(virq); |
368 | return 0; | |
369 | } | |
54a90588 | 370 | pr_debug("create_direct obtained virq %d\n", virq); |
cc79ca69 | 371 | |
98aa468e | 372 | if (irq_domain_associate(domain, virq, virq)) { |
cc79ca69 | 373 | irq_free_desc(virq); |
03848373 | 374 | return 0; |
cc79ca69 GL |
375 | } |
376 | ||
377 | return virq; | |
378 | } | |
ecd84eb2 | 379 | EXPORT_SYMBOL_GPL(irq_create_direct_mapping); |
cc79ca69 GL |
380 | |
381 | /** | |
382 | * irq_create_mapping() - Map a hardware interrupt into linux irq space | |
68700650 GL |
383 | * @domain: domain owning this hardware interrupt or NULL for default domain |
384 | * @hwirq: hardware irq number in that domain space | |
cc79ca69 GL |
385 | * |
386 | * Only one mapping per hardware interrupt is permitted. Returns a linux | |
387 | * irq number. | |
388 | * If the sense/trigger is to be specified, set_irq_type() should be called | |
389 | * on the number returned from that call. | |
390 | */ | |
68700650 | 391 | unsigned int irq_create_mapping(struct irq_domain *domain, |
cc79ca69 GL |
392 | irq_hw_number_t hwirq) |
393 | { | |
5b7526e3 | 394 | int virq; |
cc79ca69 | 395 | |
54a90588 | 396 | pr_debug("irq_create_mapping(0x%p, 0x%lx)\n", domain, hwirq); |
cc79ca69 | 397 | |
68700650 GL |
398 | /* Look for default domain if nececssary */ |
399 | if (domain == NULL) | |
400 | domain = irq_default_domain; | |
401 | if (domain == NULL) { | |
798f0fd1 | 402 | WARN(1, "%s(, %lx) called with NULL domain\n", __func__, hwirq); |
03848373 | 403 | return 0; |
cc79ca69 | 404 | } |
54a90588 | 405 | pr_debug("-> using domain @%p\n", domain); |
cc79ca69 GL |
406 | |
407 | /* Check if mapping already exists */ | |
68700650 | 408 | virq = irq_find_mapping(domain, hwirq); |
03848373 | 409 | if (virq) { |
54a90588 | 410 | pr_debug("-> existing mapping on virq %d\n", virq); |
cc79ca69 GL |
411 | return virq; |
412 | } | |
413 | ||
1bc04f2c | 414 | /* Allocate a virtual interrupt number */ |
f8264e34 JL |
415 | virq = irq_domain_alloc_descs(-1, 1, hwirq, |
416 | of_node_to_nid(domain->of_node)); | |
5b7526e3 | 417 | if (virq <= 0) { |
54a90588 | 418 | pr_debug("-> virq allocation failed\n"); |
1bc04f2c | 419 | return 0; |
cc79ca69 GL |
420 | } |
421 | ||
98aa468e | 422 | if (irq_domain_associate(domain, virq, hwirq)) { |
73255704 | 423 | irq_free_desc(virq); |
03848373 | 424 | return 0; |
cc79ca69 GL |
425 | } |
426 | ||
54a90588 | 427 | pr_debug("irq %lu on domain %s mapped to virtual irq %u\n", |
efd68e72 | 428 | hwirq, of_node_full_name(domain->of_node), virq); |
cc79ca69 GL |
429 | |
430 | return virq; | |
431 | } | |
432 | EXPORT_SYMBOL_GPL(irq_create_mapping); | |
433 | ||
98aa468e GL |
434 | /** |
435 | * irq_create_strict_mappings() - Map a range of hw irqs to fixed linux irqs | |
436 | * @domain: domain owning the interrupt range | |
437 | * @irq_base: beginning of linux IRQ range | |
438 | * @hwirq_base: beginning of hardware IRQ range | |
439 | * @count: Number of interrupts to map | |
440 | * | |
441 | * This routine is used for allocating and mapping a range of hardware | |
442 | * irqs to linux irqs where the linux irq numbers are at pre-defined | |
443 | * locations. For use by controllers that already have static mappings | |
444 | * to insert in to the domain. | |
445 | * | |
446 | * Non-linear users can use irq_create_identity_mapping() for IRQ-at-a-time | |
447 | * domain insertion. | |
448 | * | |
449 | * 0 is returned upon success, while any failure to establish a static | |
450 | * mapping is treated as an error. | |
451 | */ | |
452 | int irq_create_strict_mappings(struct irq_domain *domain, unsigned int irq_base, | |
453 | irq_hw_number_t hwirq_base, int count) | |
454 | { | |
455 | int ret; | |
456 | ||
457 | ret = irq_alloc_descs(irq_base, irq_base, count, | |
458 | of_node_to_nid(domain->of_node)); | |
459 | if (unlikely(ret < 0)) | |
460 | return ret; | |
461 | ||
ddaf144c | 462 | irq_domain_associate_many(domain, irq_base, hwirq_base, count); |
98aa468e GL |
463 | return 0; |
464 | } | |
465 | EXPORT_SYMBOL_GPL(irq_create_strict_mappings); | |
466 | ||
e6d30ab1 | 467 | unsigned int irq_create_of_mapping(struct of_phandle_args *irq_data) |
cc79ca69 | 468 | { |
68700650 | 469 | struct irq_domain *domain; |
cc79ca69 GL |
470 | irq_hw_number_t hwirq; |
471 | unsigned int type = IRQ_TYPE_NONE; | |
f8264e34 | 472 | int virq; |
cc79ca69 | 473 | |
e6d30ab1 | 474 | domain = irq_data->np ? irq_find_host(irq_data->np) : irq_default_domain; |
68700650 | 475 | if (!domain) { |
798f0fd1 | 476 | pr_warn("no irq domain found for %s !\n", |
e6d30ab1 | 477 | of_node_full_name(irq_data->np)); |
03848373 | 478 | return 0; |
cc79ca69 GL |
479 | } |
480 | ||
68700650 GL |
481 | /* If domain has no translation, then we assume interrupt line */ |
482 | if (domain->ops->xlate == NULL) | |
e6d30ab1 | 483 | hwirq = irq_data->args[0]; |
cc79ca69 | 484 | else { |
e6d30ab1 GL |
485 | if (domain->ops->xlate(domain, irq_data->np, irq_data->args, |
486 | irq_data->args_count, &hwirq, &type)) | |
03848373 | 487 | return 0; |
cc79ca69 GL |
488 | } |
489 | ||
0cc01aba YC |
490 | if (irq_domain_is_hierarchy(domain)) { |
491 | /* | |
492 | * If we've already configured this interrupt, | |
493 | * don't do it again, or hell will break loose. | |
494 | */ | |
495 | virq = irq_find_mapping(domain, hwirq); | |
496 | if (virq) | |
497 | return virq; | |
498 | ||
499 | virq = irq_domain_alloc_irqs(domain, 1, NUMA_NO_NODE, irq_data); | |
500 | if (virq <= 0) | |
501 | return 0; | |
502 | } else { | |
503 | /* Create mapping */ | |
504 | virq = irq_create_mapping(domain, hwirq); | |
505 | if (!virq) | |
506 | return virq; | |
507 | } | |
cc79ca69 GL |
508 | |
509 | /* Set type if specified and different than the current one */ | |
510 | if (type != IRQ_TYPE_NONE && | |
fbab62c5 | 511 | type != irq_get_trigger_type(virq)) |
cc79ca69 GL |
512 | irq_set_irq_type(virq, type); |
513 | return virq; | |
514 | } | |
515 | EXPORT_SYMBOL_GPL(irq_create_of_mapping); | |
516 | ||
517 | /** | |
518 | * irq_dispose_mapping() - Unmap an interrupt | |
519 | * @virq: linux irq number of the interrupt to unmap | |
520 | */ | |
521 | void irq_dispose_mapping(unsigned int virq) | |
522 | { | |
523 | struct irq_data *irq_data = irq_get_irq_data(virq); | |
68700650 | 524 | struct irq_domain *domain; |
cc79ca69 | 525 | |
03848373 | 526 | if (!virq || !irq_data) |
cc79ca69 GL |
527 | return; |
528 | ||
68700650 GL |
529 | domain = irq_data->domain; |
530 | if (WARN_ON(domain == NULL)) | |
cc79ca69 GL |
531 | return; |
532 | ||
ddaf144c | 533 | irq_domain_disassociate(domain, virq); |
cc79ca69 GL |
534 | irq_free_desc(virq); |
535 | } | |
536 | EXPORT_SYMBOL_GPL(irq_dispose_mapping); | |
537 | ||
538 | /** | |
539 | * irq_find_mapping() - Find a linux irq from an hw irq number. | |
68700650 GL |
540 | * @domain: domain owning this hardware interrupt |
541 | * @hwirq: hardware irq number in that domain space | |
cc79ca69 | 542 | */ |
68700650 | 543 | unsigned int irq_find_mapping(struct irq_domain *domain, |
cc79ca69 GL |
544 | irq_hw_number_t hwirq) |
545 | { | |
4c0946c4 | 546 | struct irq_data *data; |
cc79ca69 | 547 | |
68700650 GL |
548 | /* Look for default domain if nececssary */ |
549 | if (domain == NULL) | |
550 | domain = irq_default_domain; | |
551 | if (domain == NULL) | |
03848373 | 552 | return 0; |
cc79ca69 | 553 | |
1aa0dd94 | 554 | if (hwirq < domain->revmap_direct_max_irq) { |
f8264e34 JL |
555 | data = irq_domain_get_irq_data(domain, hwirq); |
556 | if (data && data->hwirq == hwirq) | |
4c0946c4 | 557 | return hwirq; |
4c0946c4 GL |
558 | } |
559 | ||
d3dcb436 GL |
560 | /* Check if the hwirq is in the linear revmap. */ |
561 | if (hwirq < domain->revmap_size) | |
562 | return domain->linear_revmap[hwirq]; | |
cc79ca69 | 563 | |
d3dcb436 GL |
564 | rcu_read_lock(); |
565 | data = radix_tree_lookup(&domain->revmap_tree, hwirq); | |
566 | rcu_read_unlock(); | |
567 | return data ? data->irq : 0; | |
cc79ca69 | 568 | } |
cc79ca69 | 569 | EXPORT_SYMBOL_GPL(irq_find_mapping); |
cc79ca69 | 570 | |
092b2fb0 | 571 | #ifdef CONFIG_IRQ_DOMAIN_DEBUG |
cc79ca69 GL |
572 | static int virq_debug_show(struct seq_file *m, void *private) |
573 | { | |
574 | unsigned long flags; | |
575 | struct irq_desc *desc; | |
1400ea86 GL |
576 | struct irq_domain *domain; |
577 | struct radix_tree_iter iter; | |
578 | void *data, **slot; | |
cc79ca69 GL |
579 | int i; |
580 | ||
1400ea86 GL |
581 | seq_printf(m, " %-16s %-6s %-10s %-10s %s\n", |
582 | "name", "mapped", "linear-max", "direct-max", "devtree-node"); | |
583 | mutex_lock(&irq_domain_mutex); | |
584 | list_for_each_entry(domain, &irq_domain_list, link) { | |
585 | int count = 0; | |
586 | radix_tree_for_each_slot(slot, &domain->revmap_tree, &iter, 0) | |
587 | count++; | |
588 | seq_printf(m, "%c%-16s %6u %10u %10u %s\n", | |
589 | domain == irq_default_domain ? '*' : ' ', domain->name, | |
590 | domain->revmap_size + count, domain->revmap_size, | |
591 | domain->revmap_direct_max_irq, | |
592 | domain->of_node ? of_node_full_name(domain->of_node) : ""); | |
593 | } | |
594 | mutex_unlock(&irq_domain_mutex); | |
595 | ||
596 | seq_printf(m, "%-5s %-7s %-15s %-*s %6s %-14s %s\n", "irq", "hwirq", | |
5269a9ab | 597 | "chip name", (int)(2 * sizeof(void *) + 2), "chip data", |
1400ea86 | 598 | "active", "type", "domain"); |
cc79ca69 GL |
599 | |
600 | for (i = 1; i < nr_irqs; i++) { | |
601 | desc = irq_to_desc(i); | |
602 | if (!desc) | |
603 | continue; | |
604 | ||
605 | raw_spin_lock_irqsave(&desc->lock, flags); | |
1400ea86 | 606 | domain = desc->irq_data.domain; |
cc79ca69 | 607 | |
1400ea86 | 608 | if (domain) { |
cc79ca69 | 609 | struct irq_chip *chip; |
1400ea86 GL |
610 | int hwirq = desc->irq_data.hwirq; |
611 | bool direct; | |
cc79ca69 GL |
612 | |
613 | seq_printf(m, "%5d ", i); | |
1400ea86 | 614 | seq_printf(m, "0x%05x ", hwirq); |
cc79ca69 GL |
615 | |
616 | chip = irq_desc_get_chip(desc); | |
0bb4afb4 | 617 | seq_printf(m, "%-15s ", (chip && chip->name) ? chip->name : "none"); |
cc79ca69 GL |
618 | |
619 | data = irq_desc_get_chip_data(desc); | |
15e06bf6 | 620 | seq_printf(m, data ? "0x%p " : " %p ", data); |
cc79ca69 | 621 | |
1400ea86 GL |
622 | seq_printf(m, " %c ", (desc->action && desc->action->handler) ? '*' : ' '); |
623 | direct = (i == hwirq) && (i < domain->revmap_direct_max_irq); | |
624 | seq_printf(m, "%6s%-8s ", | |
625 | (hwirq < domain->revmap_size) ? "LINEAR" : "RADIX", | |
626 | direct ? "(DIRECT)" : ""); | |
0bb4afb4 | 627 | seq_printf(m, "%s\n", desc->irq_data.domain->name); |
cc79ca69 GL |
628 | } |
629 | ||
630 | raw_spin_unlock_irqrestore(&desc->lock, flags); | |
631 | } | |
632 | ||
633 | return 0; | |
634 | } | |
635 | ||
636 | static int virq_debug_open(struct inode *inode, struct file *file) | |
637 | { | |
638 | return single_open(file, virq_debug_show, inode->i_private); | |
639 | } | |
640 | ||
641 | static const struct file_operations virq_debug_fops = { | |
642 | .open = virq_debug_open, | |
643 | .read = seq_read, | |
644 | .llseek = seq_lseek, | |
645 | .release = single_release, | |
646 | }; | |
647 | ||
648 | static int __init irq_debugfs_init(void) | |
649 | { | |
092b2fb0 | 650 | if (debugfs_create_file("irq_domain_mapping", S_IRUGO, NULL, |
cc79ca69 GL |
651 | NULL, &virq_debug_fops) == NULL) |
652 | return -ENOMEM; | |
653 | ||
654 | return 0; | |
655 | } | |
656 | __initcall(irq_debugfs_init); | |
092b2fb0 | 657 | #endif /* CONFIG_IRQ_DOMAIN_DEBUG */ |
cc79ca69 | 658 | |
16b2e6e2 GL |
659 | /** |
660 | * irq_domain_xlate_onecell() - Generic xlate for direct one cell bindings | |
661 | * | |
662 | * Device Tree IRQ specifier translation function which works with one cell | |
663 | * bindings where the cell value maps directly to the hwirq number. | |
664 | */ | |
665 | int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr, | |
666 | const u32 *intspec, unsigned int intsize, | |
667 | unsigned long *out_hwirq, unsigned int *out_type) | |
7e713301 | 668 | { |
16b2e6e2 | 669 | if (WARN_ON(intsize < 1)) |
7e713301 | 670 | return -EINVAL; |
7e713301 GL |
671 | *out_hwirq = intspec[0]; |
672 | *out_type = IRQ_TYPE_NONE; | |
7e713301 GL |
673 | return 0; |
674 | } | |
16b2e6e2 GL |
675 | EXPORT_SYMBOL_GPL(irq_domain_xlate_onecell); |
676 | ||
677 | /** | |
678 | * irq_domain_xlate_twocell() - Generic xlate for direct two cell bindings | |
679 | * | |
680 | * Device Tree IRQ specifier translation function which works with two cell | |
681 | * bindings where the cell values map directly to the hwirq number | |
682 | * and linux irq flags. | |
683 | */ | |
684 | int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr, | |
685 | const u32 *intspec, unsigned int intsize, | |
686 | irq_hw_number_t *out_hwirq, unsigned int *out_type) | |
687 | { | |
688 | if (WARN_ON(intsize < 2)) | |
689 | return -EINVAL; | |
690 | *out_hwirq = intspec[0]; | |
691 | *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK; | |
692 | return 0; | |
693 | } | |
694 | EXPORT_SYMBOL_GPL(irq_domain_xlate_twocell); | |
695 | ||
696 | /** | |
697 | * irq_domain_xlate_onetwocell() - Generic xlate for one or two cell bindings | |
698 | * | |
699 | * Device Tree IRQ specifier translation function which works with either one | |
700 | * or two cell bindings where the cell values map directly to the hwirq number | |
701 | * and linux irq flags. | |
702 | * | |
703 | * Note: don't use this function unless your interrupt controller explicitly | |
704 | * supports both one and two cell bindings. For the majority of controllers | |
705 | * the _onecell() or _twocell() variants above should be used. | |
706 | */ | |
707 | int irq_domain_xlate_onetwocell(struct irq_domain *d, | |
708 | struct device_node *ctrlr, | |
709 | const u32 *intspec, unsigned int intsize, | |
710 | unsigned long *out_hwirq, unsigned int *out_type) | |
711 | { | |
712 | if (WARN_ON(intsize < 1)) | |
713 | return -EINVAL; | |
714 | *out_hwirq = intspec[0]; | |
715 | *out_type = (intsize > 1) ? intspec[1] : IRQ_TYPE_NONE; | |
716 | return 0; | |
717 | } | |
718 | EXPORT_SYMBOL_GPL(irq_domain_xlate_onetwocell); | |
7e713301 | 719 | |
a18dc81b | 720 | const struct irq_domain_ops irq_domain_simple_ops = { |
16b2e6e2 | 721 | .xlate = irq_domain_xlate_onetwocell, |
75294957 GL |
722 | }; |
723 | EXPORT_SYMBOL_GPL(irq_domain_simple_ops); | |
f8264e34 JL |
724 | |
725 | static int irq_domain_alloc_descs(int virq, unsigned int cnt, | |
726 | irq_hw_number_t hwirq, int node) | |
727 | { | |
728 | unsigned int hint; | |
729 | ||
730 | if (virq >= 0) { | |
731 | virq = irq_alloc_descs(virq, virq, cnt, node); | |
732 | } else { | |
733 | hint = hwirq % nr_irqs; | |
734 | if (hint == 0) | |
735 | hint++; | |
736 | virq = irq_alloc_descs_from(hint, cnt, node); | |
737 | if (virq <= 0 && hint > 1) | |
738 | virq = irq_alloc_descs_from(1, cnt, node); | |
739 | } | |
740 | ||
741 | return virq; | |
742 | } | |
743 | ||
744 | #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY | |
745 | static void irq_domain_insert_irq(int virq) | |
746 | { | |
747 | struct irq_data *data; | |
748 | ||
749 | for (data = irq_get_irq_data(virq); data; data = data->parent_data) { | |
750 | struct irq_domain *domain = data->domain; | |
751 | irq_hw_number_t hwirq = data->hwirq; | |
752 | ||
753 | if (hwirq < domain->revmap_size) { | |
754 | domain->linear_revmap[hwirq] = virq; | |
755 | } else { | |
756 | mutex_lock(&revmap_trees_mutex); | |
757 | radix_tree_insert(&domain->revmap_tree, hwirq, data); | |
758 | mutex_unlock(&revmap_trees_mutex); | |
759 | } | |
760 | ||
761 | /* If not already assigned, give the domain the chip's name */ | |
762 | if (!domain->name && data->chip) | |
763 | domain->name = data->chip->name; | |
764 | } | |
765 | ||
766 | irq_clear_status_flags(virq, IRQ_NOREQUEST); | |
767 | } | |
768 | ||
769 | static void irq_domain_remove_irq(int virq) | |
770 | { | |
771 | struct irq_data *data; | |
772 | ||
773 | irq_set_status_flags(virq, IRQ_NOREQUEST); | |
774 | irq_set_chip_and_handler(virq, NULL, NULL); | |
775 | synchronize_irq(virq); | |
776 | smp_mb(); | |
777 | ||
778 | for (data = irq_get_irq_data(virq); data; data = data->parent_data) { | |
779 | struct irq_domain *domain = data->domain; | |
780 | irq_hw_number_t hwirq = data->hwirq; | |
781 | ||
782 | if (hwirq < domain->revmap_size) { | |
783 | domain->linear_revmap[hwirq] = 0; | |
784 | } else { | |
785 | mutex_lock(&revmap_trees_mutex); | |
786 | radix_tree_delete(&domain->revmap_tree, hwirq); | |
787 | mutex_unlock(&revmap_trees_mutex); | |
788 | } | |
789 | } | |
790 | } | |
791 | ||
792 | static struct irq_data *irq_domain_insert_irq_data(struct irq_domain *domain, | |
793 | struct irq_data *child) | |
794 | { | |
795 | struct irq_data *irq_data; | |
796 | ||
797 | irq_data = kzalloc_node(sizeof(*irq_data), GFP_KERNEL, child->node); | |
798 | if (irq_data) { | |
799 | child->parent_data = irq_data; | |
800 | irq_data->irq = child->irq; | |
801 | irq_data->node = child->node; | |
802 | irq_data->domain = domain; | |
803 | } | |
804 | ||
805 | return irq_data; | |
806 | } | |
807 | ||
808 | static void irq_domain_free_irq_data(unsigned int virq, unsigned int nr_irqs) | |
809 | { | |
810 | struct irq_data *irq_data, *tmp; | |
811 | int i; | |
812 | ||
813 | for (i = 0; i < nr_irqs; i++) { | |
814 | irq_data = irq_get_irq_data(virq + i); | |
815 | tmp = irq_data->parent_data; | |
816 | irq_data->parent_data = NULL; | |
817 | irq_data->domain = NULL; | |
818 | ||
819 | while (tmp) { | |
820 | irq_data = tmp; | |
821 | tmp = tmp->parent_data; | |
822 | kfree(irq_data); | |
823 | } | |
824 | } | |
825 | } | |
826 | ||
827 | static int irq_domain_alloc_irq_data(struct irq_domain *domain, | |
828 | unsigned int virq, unsigned int nr_irqs) | |
829 | { | |
830 | struct irq_data *irq_data; | |
831 | struct irq_domain *parent; | |
832 | int i; | |
833 | ||
834 | /* The outermost irq_data is embedded in struct irq_desc */ | |
835 | for (i = 0; i < nr_irqs; i++) { | |
836 | irq_data = irq_get_irq_data(virq + i); | |
837 | irq_data->domain = domain; | |
838 | ||
839 | for (parent = domain->parent; parent; parent = parent->parent) { | |
840 | irq_data = irq_domain_insert_irq_data(parent, irq_data); | |
841 | if (!irq_data) { | |
842 | irq_domain_free_irq_data(virq, i + 1); | |
843 | return -ENOMEM; | |
844 | } | |
845 | } | |
846 | } | |
847 | ||
848 | return 0; | |
849 | } | |
850 | ||
851 | /** | |
852 | * irq_domain_get_irq_data - Get irq_data associated with @virq and @domain | |
853 | * @domain: domain to match | |
854 | * @virq: IRQ number to get irq_data | |
855 | */ | |
856 | struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain, | |
857 | unsigned int virq) | |
858 | { | |
859 | struct irq_data *irq_data; | |
860 | ||
861 | for (irq_data = irq_get_irq_data(virq); irq_data; | |
862 | irq_data = irq_data->parent_data) | |
863 | if (irq_data->domain == domain) | |
864 | return irq_data; | |
865 | ||
866 | return NULL; | |
867 | } | |
868 | ||
869 | /** | |
870 | * irq_domain_set_hwirq_and_chip - Set hwirq and irqchip of @virq at @domain | |
871 | * @domain: Interrupt domain to match | |
872 | * @virq: IRQ number | |
873 | * @hwirq: The hwirq number | |
874 | * @chip: The associated interrupt chip | |
875 | * @chip_data: The associated chip data | |
876 | */ | |
877 | int irq_domain_set_hwirq_and_chip(struct irq_domain *domain, unsigned int virq, | |
878 | irq_hw_number_t hwirq, struct irq_chip *chip, | |
879 | void *chip_data) | |
880 | { | |
881 | struct irq_data *irq_data = irq_domain_get_irq_data(domain, virq); | |
882 | ||
883 | if (!irq_data) | |
884 | return -ENOENT; | |
885 | ||
886 | irq_data->hwirq = hwirq; | |
887 | irq_data->chip = chip ? chip : &no_irq_chip; | |
888 | irq_data->chip_data = chip_data; | |
889 | ||
890 | return 0; | |
891 | } | |
892 | ||
1b537708 JL |
893 | /** |
894 | * irq_domain_set_info - Set the complete data for a @virq in @domain | |
895 | * @domain: Interrupt domain to match | |
896 | * @virq: IRQ number | |
897 | * @hwirq: The hardware interrupt number | |
898 | * @chip: The associated interrupt chip | |
899 | * @chip_data: The associated interrupt chip data | |
900 | * @handler: The interrupt flow handler | |
901 | * @handler_data: The interrupt flow handler data | |
902 | * @handler_name: The interrupt handler name | |
903 | */ | |
904 | void irq_domain_set_info(struct irq_domain *domain, unsigned int virq, | |
905 | irq_hw_number_t hwirq, struct irq_chip *chip, | |
906 | void *chip_data, irq_flow_handler_t handler, | |
907 | void *handler_data, const char *handler_name) | |
908 | { | |
909 | irq_domain_set_hwirq_and_chip(domain, virq, hwirq, chip, chip_data); | |
910 | __irq_set_handler(virq, handler, 0, handler_name); | |
911 | irq_set_handler_data(virq, handler_data); | |
912 | } | |
913 | ||
f8264e34 JL |
914 | /** |
915 | * irq_domain_reset_irq_data - Clear hwirq, chip and chip_data in @irq_data | |
916 | * @irq_data: The pointer to irq_data | |
917 | */ | |
918 | void irq_domain_reset_irq_data(struct irq_data *irq_data) | |
919 | { | |
920 | irq_data->hwirq = 0; | |
921 | irq_data->chip = &no_irq_chip; | |
922 | irq_data->chip_data = NULL; | |
923 | } | |
924 | ||
925 | /** | |
926 | * irq_domain_free_irqs_common - Clear irq_data and free the parent | |
927 | * @domain: Interrupt domain to match | |
928 | * @virq: IRQ number to start with | |
929 | * @nr_irqs: The number of irqs to free | |
930 | */ | |
931 | void irq_domain_free_irqs_common(struct irq_domain *domain, unsigned int virq, | |
932 | unsigned int nr_irqs) | |
933 | { | |
934 | struct irq_data *irq_data; | |
935 | int i; | |
936 | ||
937 | for (i = 0; i < nr_irqs; i++) { | |
938 | irq_data = irq_domain_get_irq_data(domain, virq + i); | |
939 | if (irq_data) | |
940 | irq_domain_reset_irq_data(irq_data); | |
941 | } | |
942 | irq_domain_free_irqs_parent(domain, virq, nr_irqs); | |
943 | } | |
944 | ||
945 | /** | |
946 | * irq_domain_free_irqs_top - Clear handler and handler data, clear irqdata and free parent | |
947 | * @domain: Interrupt domain to match | |
948 | * @virq: IRQ number to start with | |
949 | * @nr_irqs: The number of irqs to free | |
950 | */ | |
951 | void irq_domain_free_irqs_top(struct irq_domain *domain, unsigned int virq, | |
952 | unsigned int nr_irqs) | |
953 | { | |
954 | int i; | |
955 | ||
956 | for (i = 0; i < nr_irqs; i++) { | |
957 | irq_set_handler_data(virq + i, NULL); | |
958 | irq_set_handler(virq + i, NULL); | |
959 | } | |
960 | irq_domain_free_irqs_common(domain, virq, nr_irqs); | |
961 | } | |
962 | ||
963 | /** | |
964 | * __irq_domain_alloc_irqs - Allocate IRQs from domain | |
965 | * @domain: domain to allocate from | |
966 | * @irq_base: allocate specified IRQ nubmer if irq_base >= 0 | |
967 | * @nr_irqs: number of IRQs to allocate | |
968 | * @node: NUMA node id for memory allocation | |
969 | * @arg: domain specific argument | |
970 | * @realloc: IRQ descriptors have already been allocated if true | |
971 | * | |
972 | * Allocate IRQ numbers and initialized all data structures to support | |
973 | * hierarchy IRQ domains. | |
974 | * Parameter @realloc is mainly to support legacy IRQs. | |
975 | * Returns error code or allocated IRQ number | |
976 | * | |
977 | * The whole process to setup an IRQ has been split into two steps. | |
978 | * The first step, __irq_domain_alloc_irqs(), is to allocate IRQ | |
979 | * descriptor and required hardware resources. The second step, | |
980 | * irq_domain_activate_irq(), is to program hardwares with preallocated | |
981 | * resources. In this way, it's easier to rollback when failing to | |
982 | * allocate resources. | |
983 | */ | |
984 | int __irq_domain_alloc_irqs(struct irq_domain *domain, int irq_base, | |
985 | unsigned int nr_irqs, int node, void *arg, | |
986 | bool realloc) | |
987 | { | |
988 | int i, ret, virq; | |
989 | ||
990 | if (domain == NULL) { | |
991 | domain = irq_default_domain; | |
992 | if (WARN(!domain, "domain is NULL; cannot allocate IRQ\n")) | |
993 | return -EINVAL; | |
994 | } | |
995 | ||
996 | if (!domain->ops->alloc) { | |
997 | pr_debug("domain->ops->alloc() is NULL\n"); | |
998 | return -ENOSYS; | |
999 | } | |
1000 | ||
1001 | if (realloc && irq_base >= 0) { | |
1002 | virq = irq_base; | |
1003 | } else { | |
1004 | virq = irq_domain_alloc_descs(irq_base, nr_irqs, 0, node); | |
1005 | if (virq < 0) { | |
1006 | pr_debug("cannot allocate IRQ(base %d, count %d)\n", | |
1007 | irq_base, nr_irqs); | |
1008 | return virq; | |
1009 | } | |
1010 | } | |
1011 | ||
1012 | if (irq_domain_alloc_irq_data(domain, virq, nr_irqs)) { | |
1013 | pr_debug("cannot allocate memory for IRQ%d\n", virq); | |
1014 | ret = -ENOMEM; | |
1015 | goto out_free_desc; | |
1016 | } | |
1017 | ||
1018 | mutex_lock(&irq_domain_mutex); | |
1019 | ret = domain->ops->alloc(domain, virq, nr_irqs, arg); | |
1020 | if (ret < 0) { | |
1021 | mutex_unlock(&irq_domain_mutex); | |
1022 | goto out_free_irq_data; | |
1023 | } | |
1024 | for (i = 0; i < nr_irqs; i++) | |
1025 | irq_domain_insert_irq(virq + i); | |
1026 | mutex_unlock(&irq_domain_mutex); | |
1027 | ||
1028 | return virq; | |
1029 | ||
1030 | out_free_irq_data: | |
1031 | irq_domain_free_irq_data(virq, nr_irqs); | |
1032 | out_free_desc: | |
1033 | irq_free_descs(virq, nr_irqs); | |
1034 | return ret; | |
1035 | } | |
1036 | ||
1037 | /** | |
1038 | * irq_domain_free_irqs - Free IRQ number and associated data structures | |
1039 | * @virq: base IRQ number | |
1040 | * @nr_irqs: number of IRQs to free | |
1041 | */ | |
1042 | void irq_domain_free_irqs(unsigned int virq, unsigned int nr_irqs) | |
1043 | { | |
1044 | struct irq_data *data = irq_get_irq_data(virq); | |
1045 | int i; | |
1046 | ||
1047 | if (WARN(!data || !data->domain || !data->domain->ops->free, | |
1048 | "NULL pointer, cannot free irq\n")) | |
1049 | return; | |
1050 | ||
1051 | mutex_lock(&irq_domain_mutex); | |
1052 | for (i = 0; i < nr_irqs; i++) | |
1053 | irq_domain_remove_irq(virq + i); | |
1054 | data->domain->ops->free(data->domain, virq, nr_irqs); | |
1055 | mutex_unlock(&irq_domain_mutex); | |
1056 | ||
1057 | irq_domain_free_irq_data(virq, nr_irqs); | |
1058 | irq_free_descs(virq, nr_irqs); | |
1059 | } | |
1060 | ||
1061 | /** | |
1062 | * irq_domain_activate_irq - Call domain_ops->activate recursively to activate | |
1063 | * interrupt | |
1064 | * @irq_data: outermost irq_data associated with interrupt | |
1065 | * | |
1066 | * This is the second step to call domain_ops->activate to program interrupt | |
1067 | * controllers, so the interrupt could actually get delivered. | |
1068 | */ | |
1069 | void irq_domain_activate_irq(struct irq_data *irq_data) | |
1070 | { | |
1071 | if (irq_data && irq_data->domain) { | |
1072 | struct irq_domain *domain = irq_data->domain; | |
1073 | ||
1074 | if (irq_data->parent_data) | |
1075 | irq_domain_activate_irq(irq_data->parent_data); | |
1076 | if (domain->ops->activate) | |
1077 | domain->ops->activate(domain, irq_data); | |
1078 | } | |
1079 | } | |
1080 | ||
1081 | /** | |
1082 | * irq_domain_deactivate_irq - Call domain_ops->deactivate recursively to | |
1083 | * deactivate interrupt | |
1084 | * @irq_data: outermost irq_data associated with interrupt | |
1085 | * | |
1086 | * It calls domain_ops->deactivate to program interrupt controllers to disable | |
1087 | * interrupt delivery. | |
1088 | */ | |
1089 | void irq_domain_deactivate_irq(struct irq_data *irq_data) | |
1090 | { | |
1091 | if (irq_data && irq_data->domain) { | |
1092 | struct irq_domain *domain = irq_data->domain; | |
1093 | ||
1094 | if (domain->ops->deactivate) | |
1095 | domain->ops->deactivate(domain, irq_data); | |
1096 | if (irq_data->parent_data) | |
1097 | irq_domain_deactivate_irq(irq_data->parent_data); | |
1098 | } | |
1099 | } | |
1100 | ||
1101 | static void irq_domain_check_hierarchy(struct irq_domain *domain) | |
1102 | { | |
1103 | /* Hierarchy irq_domains must implement callback alloc() */ | |
1104 | if (domain->ops->alloc) | |
1105 | domain->flags |= IRQ_DOMAIN_FLAG_HIERARCHY; | |
1106 | } | |
1107 | #else /* CONFIG_IRQ_DOMAIN_HIERARCHY */ | |
1108 | /** | |
1109 | * irq_domain_get_irq_data - Get irq_data associated with @virq and @domain | |
1110 | * @domain: domain to match | |
1111 | * @virq: IRQ number to get irq_data | |
1112 | */ | |
1113 | struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain, | |
1114 | unsigned int virq) | |
1115 | { | |
1116 | struct irq_data *irq_data = irq_get_irq_data(virq); | |
1117 | ||
1118 | return (irq_data && irq_data->domain == domain) ? irq_data : NULL; | |
1119 | } | |
1120 | ||
1121 | static void irq_domain_check_hierarchy(struct irq_domain *domain) | |
1122 | { | |
1123 | } | |
1124 | #endif /* CONFIG_IRQ_DOMAIN_HIERARCHY */ |